APA (7th ed.) Citation

Great Britain. Department of Transport & Great Britain. Government Statistical Service. Road travel speeds on English trunk roads. HMSO.

Chicago Style (17th ed.) Citation

Great Britain. Department of Transport and Great Britain. Government Statistical Service. Road Travel Speeds on English Trunk Roads. London: HMSO.

MLA (9th ed.) Citation

Great Britain. Department of Transport and Great Britain. Government Statistical Service. Road Travel Speeds on English Trunk Roads. HMSO.

Warning: These citations may not always be 100% accurate.